Slotted tuyere for underfeed stokers



Peb. 18, 1941.

H. c. CARTER 2,231,987 sLoTTE'TUYERE'FoR UNDERFEED sToKERs f' Filed Feb. 19, `195s H. C. CARTER j l fm. e t1 TURA/E 5/ 45 the ports 2i.

Patented Feb. 18, 1.941

UNITED f STATES PATENT oFFICE sLo'rran Tornar: Fon UNnEnrEun f s'roxnns Haskell C. Carter, Portland, Oreg., assigner to Iron land, Oreg.`

Manufacturing hCompany, Port- Appueauon February 19,1938, serial No. 191,476

" s claims. (c1. 11o-45) 'I'his invention relates generally underfeed stokers, and particularly to a slotted tuyre to be used in conjunction therewith.

The main object of this invention is the con- V16 of the air over the fuel bed; 'Ihe fourth object is to add to the life of the tuyre element by holding it to an integral form at a place remote from ,the zone of high temperatures.

20 I accomplish theseV and other objects in the manner set forth in the following specication as illustrated in the accompanying drawing, in which: v

Fig. 1 isv a perspective view of a complete z5 tuyre.

Fig. 2 is a section taken along the line 2-2 in Fig. 1. -Y

Fig. 3 is a fragmentary section through a furnace showing the retort installed therein and the tuyre element mounted on the retort.

Similar numerals referl to similar parts throughout the several views. v

Referring in detail to the dra-wing, there is shown a wall I0 upon which is mounted the boiler Il. Upon the door I2 is mounted a retort i3, such as are commonly employed in underfeed stokers. Upon the retort I! ismounted v `the tuyre section Il. A table il surrounds the tuqre section Il and extends to the wall Il. 40 Referring particularly to the tuyre section I4,

it will ybe noted that same has a cylindrical out- Aer surface' I6 and a sloping innersurface I1. The space I8 between the inner wall I! and the outer -wall 2li constitutes a means for supplying air to .I iirv enters the space Il through the openings 2 2 from the retort sectionv I3. It is desirable to provide the underside I! of the tuyre with an extension 24 which projects into the retort I2 and facilitates the centering of the tuyre section I4 with relation to the retort I3.

It will be noted that around the upper edge of the tuyre Il are formed a plurality of castles 25 having inner and outer ports 2l. Vertical slots Il 21 extend downwardly between pairs of castles 25 A '3. A unitary circular tuyre element havingI a to a point below the bottom 28 of the lowermost port 2|. The slots 21 range from 1,/4" to V2" in width. The side walls 29 connect the inner and outer walls I9 and 20 on each side of each slot 21. `In some cases, especially with the larger 5 tuyres, itis desirable to provide the V-notches Blmidway between the slots 21 for the purpose of further detracting from the distorting iniluence of temperature changes.

In the drawing are shown the lugs 3l which 10 are disposed around the lower side of the tuyre Il, that is, being merely employed for the purpose of-` holding the tuyre I4 in its proper relal tionship.

It is a well known fact that tuyres have long constructed for underfeed stokers in which the tuyre element was unitary. Such tuyres, however, were /found to be' objectionable owing to the growth of the upper portion of the tuyre r caused by the intense and prolonged heating thereof until the tuyre elementv itself became fracturedas a result thereof. This led to the I adoption of a sectional tuyre, which, although having certain advantagesas far as breaking was concerned, had other disadvantages such as 2s the cost of manufacture and installation, the difiiculty of sealing against air leakages, holding same in position and other minor faults.

This brought'about the adoption of a one piece tuyre provided with the slots 21 which prevent 30 the growing" stresses from reaching the lowermost portion of the tuyre which, of course, is the portion of` the tuyre that holds the uppermost portions together.`

I claimt 35 1. A unitary circular tuyre element having air outlet openings in the walls thereof and having radial slots formed through the top thereof extending below the lowermost air. outlet.

2f A unitary circular tuyrehaving a conver'g- 40 ing inner wall and a cylindrical outer wall spaced therefrom and having air outlet openings formed in the inner wall, said tuyre having radial slots formed therein extending from the top thereof to a plane below the lowermost air outlet.

converging inner wall and a cylindrical outer wall and having air outlets along the uppermost portion of the inner wall and having radial expansion slots formed through both the .inner and outer walls from the top thereof to a plane below the lowermost air outlet. l

4. A circular tuyre element comprising inner and outer walls and havingan air space lbetween l said walls, said inner walls having air outlet slotsl formed therein communicating withsaid air space', Vsaid tuyre having radial slots formed Y therethrough from the top thereof to a point below the lowermost air outlet but not communicating with said air space.

5; A tuyre element conslstingof an integral circular ring having formed on the top side thereof apluxzality of arcuate elements uniting to form a circular re pot separated by radial channels extending from rthe top thereof to a point belowthat portion of the tuyre which is exposed to intense heat. I'

A tuyre of the class'described having circular inner and outer walls and having an an- -nular row of castles formed around the top there- 

